Blade-fastening.



' PATENTED DEC. 31, 1907.

N. G. BASSETT BLADE FASTENING.

APPLICATION FILED OCT. 29, 1906. RENEWED JUNE 14'. 1907.

INIOENTOR MTTORNET:

UNITED STATES FATENT OFFICE.

NORMAN 0. BASSETT, OF MILWAUKEE, WISCONSIN, ASSIGNOR 'lO ALLIS-CIIA LMERS COMPANY,

OF. MILWAUKEE, WISCONSIN, A CORPORATION OF NEW JERSEY.

BLADE-FASTENING.

Specifieationof Letters Patent.

Patented Dec. 31, 1907.

Application filed October 29. 1906. Serial No.- 34L074. Renewed June 14, 1907.- Serial No. 378,925-

ling fluid, and generally it relates to afastenmg means which is capable of being used in any relation where it is desirable to firmly secure a plurality of elements to a member.

This invention relates specifically to that class of devices, as steam turbines, for example, where a plurality of blades or similarelements areassembled in a holding member and are then securely fastened within a recess provided by a blade-carrying member. It is common in steam turbines, for example, toprovide aholding member for a plurality of blades which is seated in a'recess provided by the blade-carrying mein and the holding member and blades are We lirmly secured in said recess by a separate calking memlmr, piece orstrip which is forced into said recess.

The. purpose of this invention is to provide a holding member for they blades which is easily and cheaply constructed and to provide. for securing the blades to said holding member and within the recess of the bladecarrying member.

In th'e. drawings which accompany this specification and form a part thereof and on which :the same. reference characters designate the same elements in each of the several views and which illustrate embodiments of this invention,lf.ignrc l is a plan of a fragment of a blade-carrying member with blade secured thereto, the blades being shown in section. Fig. 2 is a vertical section of the blade-carrying member and associated parts. as shown by Fig. 1. Fig. 23 is a plan of a fragment of a blade-carrying member with blade secured thereto, the blades being shown in section, showing a modification in the. structure of the filling blocks. Fig. 4 is a vertical section of the blade-carrying lllOllllNl andthe associated parts as shown by Fig. Fig. 5 is a lan of a fragment of a blade-carrying mem er with blades secured thereto, the blades beingshown in section, showing an alternative construction. Fig. 6 is a vertical section of the blade-carrying member and associated parts as shown by Fig. 5. is a plan of a fragment of a blade-carrying member and blades secured thereto, the blades being shown in section, showin a further modification in the form of the $111- ing blocks. Fig. 8 is a vertical section of the blade-carrying member and associated parts as shown by Fig. 7.

It is the purpose of this invention to combine a blade-carrying member provided with a recess,-with a holding member, ring or stri for blades, said strip being provided with notches so formed and arranged that the blades may be readily and quickly assembled thcrewith the blades andholding strip being adapted to be seated within the recess .provided in the carrying member and revision being made by .means of filling b ocks for evening up irregularities of surface of the holding member, which filling blocks acting in con u'nction with a calking strip are adapt-- ed to fasten the blades and holding member securely within the recess of said carrying member.

The. term blades as used in this specificationand in the claims is used in the generic sense of being a plied. to any elements which may be 'assemb ed in a similar manner and is not intended to restrict the structure referred to to blades n se; the word bladesv being used in this specification as a matter of convenience as the specific fastening means disclosed herein is especially applicable to steam turbines.

Referring to the drawings, 1 represents a blade-carrying member provided with a recess 2, which recess is provided with aside undercut at 3 either of the ordinary dovetailed form, as in Figs. 2 and 4, or simply of the recessed form, as shown in Figs. 6 and 7.

Thereference character 4 in each of the several lignres of the drawings represents a holding strip which is appropriately fashioned to react with the undercut side of the recess 2 on one side, while on the other side it is provided with a plurality of notches of approximately triangular shape in plan, within which notches the. blades 5 are ada ted to be seated, said blades being eit ier' provided with enlarged heads, as shown at 50 by Figs. 5, 6, 7 and 8, or with a bent over portion at the bottom, as shown at 55- lo Figs. 1, 2, 3 and 4, or being provided wit Fig. 7

, rejections formed in any suitable or preerred manner, the projections in either case being adapted to engage with corresponding recesses 60 formed in the blade-holding member i, whereby said blades are revented from bein withdrawn endwise rom said blade-holding member 4:.

The blade -holding member 4 need not necessaril be provided with the recesses 60 with whic the projections on the blades are adapted to enact, but it may be made of less depth than the recess' in the bladecarrying member so as to provide a s acebetween the bottom of therecess and t e adjacent part of the 'blade-holtling member equal to the thickness, of the plrojections at the bottoms :of the blades. 1

is construction, however, is not considered to be as desirable asth ej construction stated above. 20.

By" providing the blade-holding membert'e with the substantially triangular shaped notches, it becomes comparatively easy. to assemble the blades With said member, and the disassembling of said blades is facilitated. With this construction, however, it may be desirable that the parts of the notches which are not occupied. by the blades be filled up by filling pieces or blocks which may assumevarious forms to meet the particular ends desired. These blocks when placed in position make and form a compact mass against which the pressure'of the calking strip 6 is exerted when said calking strip is forced home to hold the blades and bladeholding strip 4 in place in the recess of the blade-carrying member.

In Figs. 1 and 2 a plurality of holding blocks 7 are shown which fill the spaces in the blade retaining member 1, and, as clearly shown by Fig. 1 of the drawings, extend somewhat beyond the outer edge of the blades. The length of each of these blocks from a tot, as shown by Fig. 1, is somewhat less than the breadth of a blade, viz., from c to b, and the blades are recessed at -8, as

' clearly shown by Fig. 2, so that with this construction the blade is not only locked to the blade-holding member 4:, but a blade also looks a block 7 within the recess 2, whereby when the calking strip 6 is driven home, the

In Figs. 5. and 6 is illustrated a slightly modified construction. In'the structure as shown by these figures, the general features of iconstruction already described are retained but the filling blocks 9 are slightly beveled at their upper edge, as shown at 10, while the recess 2 in the blade-carrying member 1 has its second side undercut, as at 11, and the calking striplfi is adapted to be placed in position wit its recess offered by tlie undercut at 11 before the filling blocks are placed and after they are inserted in place to be calked down rojection 40 within the erases a ainst the beveled portion 10 of the filling b ocks 9, thereby locking the several parts firmly in place. In this construction the blades are not recessed as in the construction modification the filling blocks are in all sub' stantial particulars the same as those shown by Fig. 1 of the drawings, the only exception bein that instead of their existing as separate locks, they are formed a continuous notched strip adapted to serve with a plurality of blades, which is in some respects a counterpart of the blade-holding member 4.

In Figs. 7 and 8 is illustrated a further modification in which the filling blocks are substantially duplicates ofthe filling blocks 9 shown by Fig. 5, but both multiple and single filling blocks are used, a single filling block being desi nated by the numeral 12, and a multiple fi lling block by the numeral 13, the numeral 80 designating the joint between two sections of the blade holding member. I

In Fig. 8 the calking strip 6 is shown as a multiple deck calking member or one made up of two parts, viz., the layers 14: and 15, for convenience in calking, while the side of the recess 2 and the filling blocks are shown as provided withrecesses 16 and 17 respectively, into which the material of the calking strips is forced, thereby securely locking the several parts within said recess.

While the construction illustrated and described afiords a very convenient means for assembling a plurality of blades in a bladeholding member, it is of especial advantage whenever it is desirable to disassemble the parts, especially where only a single blade is to be removed, in which case by cuttin out the proper filling piece or art thereo the damaged blade may be rea ily removed and a new blade inserted in its place, when a new fillin piece may be introduced or any piece of suitable material may be driven or calked 2. The combination with a blade-carrying member, providedwith a recess, of a bladeholding member, provided. with notches,

seated in said recess, said blade holding member being recessed adjacent said notches,

blades provided with projections, said blades being seated in said notches with the projections thereon engaged with said blade-holding member in the recessed portions thereof, filling blocks, and means for securing said 1 blade -holding member, blades and filling blocks in the recess of said blade-carrying member.

The combination with a blade-carrying member, provided with a recess a side of which is undercut, of a blade-holding member provided with a projection adapted to engage said side within the undercut portion thereof, said blade-holding member being provided with notches and seated within said. recess and also being recessed adjacent said notches, blades provided with projections, said blades being seated in said notches with the projections thereon engaged with said blade-holding member in the recessed pertions thereof, filling blocks, and means for securing said blade-holding member, blades and filling blocks in the recess of said blade-' carrying member. 4. The-combination with a blade-carrying member, provided with a recess a side of which is undercut, of a blade-holding member provided with a projection adapted to engage said side within the undercut portion thereof, said blade-holding member being prbwiiled with notches and seated within said recess and also being recessed adjacent said notches, blades provided with projections, said blades being seated in said notches with the projections thereon engaged with said blade-holding member in the recessed portions thereof, filling blocks, and means for securing said blade-holding member, blades and filling blocks in the recess of said bladecarrying member, the blades being recessed to receive the filling blocks whereby the several parts are locked-together.

5. The combination with a blade-carrying member, provided with a recess, .of a bladeholding member and blades seated in said re cess and a multiple deck calking member also seated in said recess to secure the blade holding member and blades therein.

6. The combination with a blade-carrying member provided with a recess, of a bladeholding member, provided with a notch, a

blade and a filling block, said blade-lrolding member, blade and filling block all being seated in said recess with the blade in the notch of the blade-holding member, and means for securing them therein.

In testimony whereof, I allix my signature in the presence of two witnesses.

N( )RMAN (l. BASSETT. itnesses FRANK E. DENNE'H, JOHN ()LsnN. 

